[PATCH 5.4 134/214] usb: dwc3: pci: Allow Elkhart Lake to utilize DSM method for PM functionality

[Greg Kroah-Hartman]

From: Raymond Tan <raymond.tan@xxxxxxxxx>

commit a609ce2a13360d639b384b6ca783b38c1247f2db upstream.

Similar to some other IA platforms, Elkhart Lake too depends on the
PMU register write to request transition of Dx power state.

Thus, we add the PCI_DEVICE_ID_INTEL_EHLLP to the list of devices that
shall execute the ACPI _DSM method during D0/D3 sequence.

[heikki.krogerus@xxxxxxxxxxxxxxx: included Fixes tag]

Fixes: dbb0569de852 ("usb: dwc3: pci: Add Support for Intel Elkhart Lake Devices")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Raymond Tan <raymond.tan@xxxxxxxxx>
Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/dwc3/dwc3-pci.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -147,7 +147,8 @@ static int dwc3_pci_quirks(struct dwc3_p
 
 	if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
 		if (pdev->device == PCI_DEVICE_ID_INTEL_BXT ||
-				pdev->device == PCI_DEVICE_ID_INTEL_BXT_M) {
+		    pdev->device == PCI_DEVICE_ID_INTEL_BXT_M ||
+		    pdev->device == PCI_DEVICE_ID_INTEL_EHLLP) {
 			guid_parse(PCI_INTEL_BXT_DSM_GUID, &dwc->guid);
 			dwc->has_dsm_for_pm = true;
 		}